Power and Distribution Transformers

Transcription

1 Power and Distribution Transformers

2 VRT Power Ltd. We Enable Energy VRT is a modern manufacturer for high-performance oil-immersed power transformers up to 800 MVA 500 kv. Customized design and the development of products to our client s specific requirements are among our key competencies. VRT power transformers are built according to the highest quality and industry standards using advanced technologies for greater reliability and durability. These technologies enable us to achieve low noise transformers with excellent electrical properties and en sure long operating life of our transformers and mobile substations. The company has extensive experience and expertise in the energy sector, particularly in the area of power transmission and distribution. 3

3 VRT for Complete Solutions Products & References VRT offers its customers a full range of services with their products Products & References» Development, design and manufacturing of power transformers, distribution transformers, rectifier and furnace transformers as well as special transformers» Worldwide references prove reliable quality products according to IEC, ANSI/IEEE, CENELEC or other international standards Engineering & Design» Advanced software for optimized costs and losses» Design according to customer-specific requirements» Proven designs to withstand mechanical and electrical forces, i.e. short-circuit forces, transient overvoltages and thermal stresses Production & Testing» Manufacturing of power transformers up to 800 MVA 500 kv and mobile substations up to 50 MVA 230 kv» VRT production plant is equipped with state-of-the art manufacturing equipment» Quality assurance system for proven quality during production steps and final acceptance tests up to 1550 kv BIL Quality, Service & Support all over the world» Beside ISO 9001 and ISO VRT provides systematic continuous improvements of processes and all production steps» Final acceptance tests in our high-voltage test lab validates the quality of our transformers» VRT offers a full scope of services» After delivery, installation and commissioning customers enjoy full service from experienced service engineers in the factory or on a site» VRT also provides training for your team for safe and reliable operation of your transformer fleet» Responsibility for quality is our attitude and shared by all company employees VRT offers oil-immersed, core-type transformers in accordance with international standards and customer-specific requirements. The latest manufacturing technology allows reliable production from distribution transformers up to large power transformers of 800 MVA 500 kv. Power Transformers for Power Transmission and Distribution VRT has long experience in design and production of substation- and high -voltage grid transformers. VRT is a key player in establishing and developing the electrical infrastructure of the local utility. VRT went on to supply power transformers to utilities throughout the world and became a major player for customized network transformers. Generator Step-up Transformers (GSU) GSU transformers take the voltage level from the generator up to the transmission voltage level and are key components of any power plant. VRT has a long reference list as supplier of this sensitive link between generator and high-voltage grid which testifies to a reliable design. Special Transformers Tailor-made products and solutions for specific applications Compact Wind Turbine Step-up Transformers Our compact special transformers are designed to fulfill particular requirements such as» High rating with compact dimensions» Optimal overload performance and high temperature stability» Ability to withstand harmonics» High-end insulation systems with Aramid Nomex» Proven compatibility with system components» Optimized no-load and load losses» Usage of environmentally friendly materials like synthetic ester fluids 4 5

4 Design & Engineering Industrial Transformers Industrial application of transformers means industrial loads and conditions, i.e. operation close to short-circuit conditions and varied load cycles. Furthermore, industrial transformers are often exposed to hazardous conditions, for example in steel and aluminum production plants or in the chemical industry used as» Furnace Transformers» Drive/Converter Transformers» Rectifier Transformers» Excitation Transformers Mobile Substations VRT mobile substations are turnkey solutions for flexibility in power distribution and emergency power restoration. Once mainly used for fast power restoration in emergencies, mobile substations have found new ap plications among power generation and transmission companies seeking versatile alternatives when planning new stations, e.g. added power distribution flexibility, and as an interim power supply when performing maintenance on existing stations. Behind the high performance of a VRT power transformer is a highly motivated and experienced engineering team. The VRT Engineering Department is responsible for the electrical and mechanical design of transformers and mobile substations. Our engineers use advanced software to optimize costs and minimize losses. The software permits the verification of all calculations for mechanical and electrical stresses, such as short circuits, lightning and switching impulses, overvoltage, hot spots (magnetic field distribution in winding and metal parts), electrical field calculations and plots, noise levels, overload capacity and loss of insulation life. Successful product development and a commitment to the highest standards have placed VRT at the forefront of transformer manufacturing. The sustained investment of time and resources in development over the past sixty years has been rewarded with cutting-edge innovation:» Market-leading expertise in design and technical problem-solving» A unique library of technical product innovations provides our customers with tested and proven state-of-the-art products» Expertise of modern technology and the use of the best raw materials» A wealth of manufacturing know-how» The construction considers handling of seismic forces VRT reputation for expertise in product development is demonstrated by our customers growing demand for unique product solutions for special projects VRT is increasingly chosen to design and engineer transformers to meet those demanding requirements. The VRT research and development team has built the company s reputation for engineering excellence through the development of innovative, top-of-the-range new products and technologies. VRT is active in both CIGRE and the IEEE Transformers Committees. 6 7

5 Production & Testing VRT power transformers and mobile substations are designed for high performance. They have value-added features that ensure compliance with the relevant specifications; they are reliable and have a long service life. Core To fulfill optimized noise requirements and noload losses, grain-oriented steel sheets are cut by an automatic GEORG machine. Step-lap design assures the highest core yield. Winding The main winding operations for power transformers are performed on vertical winding machines in sealed, dust-free chambers. The coil is manufactured in its natural working position to achieve more uniform tension, which assures a superior quality winding process. Tank VRT introduced hot spray galvanizing to protect tanks and to defend against corrosion in one of the harshest climatic regions of the world the Dead Sea, an area 1,300 feet below sea level that experiences high temperatures in excess of 46 C (115 ºF), high air pressure, many highly corrosive airborne salts and environmental effects of the chemical industry. Special shot blasting equipment assures a corrosion-free tank surface prior to zinc coating and painting. Active Part VRT achieves identical coil height in its transformers through a special drying and compression process. The coils are dried under vacuum in a circular oven and pressed to the exact specified size. In a second stage, each phase coil block assembly is dried and pressed again to assure absolute accuracy. Each core and coil undergoes a vapor phase process in the oven. During the final drying, the moisture content of the transformer is reduced to less than 0.3%. This takes place at 110 ºC (230 ºF) in a vacuum of less than 0.07 millibar. While still in the oven, and under vacuum, the tank is filled with oil; the unit is flushed and then new filtered oil is introduced. Finally, the transformer is removed from the oven and the oil is processed by the oil treatment plant. Testing The VRT high-voltage laboratory extends over 1,600 sq m (15,000 sq ft) and has a height of 21 m (69 ft). All routine, design and special tests (except short-circuit withstand tests) are conducted according to IEC, IEEE, ANSI, CSA and other applicable international standards for three-phase transformers up to 800 MVA 500 kv and single-phase transformers up to 500 MVA. A complete list of testing equipment is detailed in our prequalification documentation, which is available from your VRT representative. 8 9

6 Quality, Service & Support VRT provides full consultation, installation and testing services for its transformers and mobile substations. After delivery, installation and commissioning customers enjoy full service from experienced service engineers in the factory or on-site. If repairs are necessary, these are carried out onsite or, if necessary, at a VRT contracted repair facility under the supervision of a VRT representative. VRT has opened a North American Service Centre to provide its customers with fast, professional and comprehensive service. This includes consultation, on-site installation of the transformers and full service until the end of the warranty period and beyond if required. We are interested in long-term business relationships, and our high-quality service has earned us the customer confidence necessary for long-term service agreements. 10

7 Generator Step-up Transformer» 500 MVA, 420 / 21 KV Worldwide Presence VRT offers its customers a full range of solutions, including:» Product Development» Engineering & Design» Testing Services» Manufacturing & Assembly» Transport & Full Installation Services» Training Substation Power Transformer» 150 MVA, 138 / 69 kv Mobile Substation» 50 MVA, 230 kv Distribution Transformer» 2500 kva, 20 / 0.4 KV Historic Milestones Elco was founded as a manufacturer of distribution transformers Company expands into the field of power transformers Acquired Know how and capabilities through Joint Ventures with ABB and GE Start supply of rectifier transformers up to 120 ka as well as mobile substations and furnace transformers Implementation of 400 kv transformers Building of 6 major HV substations in Thailand Elco is successful in winning its first major contracts for the North American market Delivery of first mobile substation for North American market Elco changes name to Enerco Enterprises Delivery of the first 100 units of power transformers to the North American market Acquisition of Enerco Enterprises by Von Roll, Switzerland Enerco brand name changes to Von Roll Transformers Delivery of first transformers for the wind industry Order for 650 MVA 400 / 160 kv 3 phase autotransformers The opening of North American Service Centre Acquisition of Von Roll by VRT Power Global SARL Von Roll Transformers brand name changes to VRT Power Step-up Transformers for wind parks» 3500 kva / 33 / 0.4 kv 12 13

8 VRT POWER Ltd.